Pixel Circuit Terminal Reset for Stable Refresh-Rate Switching
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Solution Overview
Problem
Display apparatuses experience poor image display quality during refresh rate switching due to differences in driving transistor characteristics between writing and idle frames, leading to abrupt changes in brightness.
Innovation Solution
A pixel circuit is designed with a reset module that resets the potentials of the driving module's terminals to a fixed voltage in both writing and idle frames, ensuring consistent bias states and transient characteristics, thereby stabilizing brightness during refresh rate changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus switches between different refresh rates, then the display can adapt to different operating modes (static images vs. dynamic scenes), but the image display quality deteriorates due to abrupt brightness changes
Solution Approach 1:
The pixel circuit performs preliminary actions by writing data voltages and compensating threshold voltages in advance during the data writing stage before the light emission stage. This ensures that the driving transistor is properly prepared with correct bias conditions before actual light emission, preventing abrupt brightness changes during refresh rate switching.
Solution Approach 2:
The pixel circuit implements periodic reset stages at fixed intervals - between data writing and light emission in writing frames, and before light emission in idle frames. This periodic resetting of the driving transistor ensures consistent transient characteristics across different refresh rates, maintaining brightness stability while enabling refresh rate adaptation.
2Productivity
If the driving transistor operates in different frames (writing vs. idle), then the display can implement frame skipping for low-frequency display, but the bias state of the driving transistor becomes inconsistent leading to poor display quality
Solution Approach 1:
The pixel circuit applies different operations to different parts of the frame cycle: in writing frames, it performs data writing followed by reset; in idle frames, it performs only reset before light emission. This localized differentiation allows frame skipping while maintaining consistent driving transistor bias states through the periodic reset operation in both frame types.
Solution Approach 2:
The pixel circuit changes the timing parameters of the reset stage based on frame type - positioning it between data writing and light emission in writing frames, and before light emission in idle frames. This parameter adjustment ensures the driving transistor reaches the same bias state before light emission regardless of frame type, enabling stable frame skipping operation.
Data Source
AI summary
A pixel circuit, a driving method therefor and a display panel are disclosed. The pixel circuit is configured to include a reset module, where the reset module is electrically connected to a first terminal or a second terminal of a driving module; and the reset module resets potentials of the first terminal and the second terminal of the driving module between a data writing stage and a light emission stage of a writing frame, and resets the potentials of the first terminal and the second terminal of the driving module before a light emission stage of an idle frame.